Publications

International Journals

• C. Ranga, T. Manoj, S. S. M. Ghoneim, Abu Siada, “Analytic Hierarchy Processed Grey Relational Fuzzy Approach for Health Assessment of Power Transformers,” Accepted in IEEE Transactions on Dielectrics and Electrical Insulation, March 2024 (SCI).

• C. Ranga, T. Manoj, S. S. M. Ghoneim, U. Mohan Rao and S. A. M. Abdelwahab, “Alternate and Effective Dissolved Gas Interpretation to Understand the Transformer Incipient Faults,” in IEEE Transactions on Dielectrics and Electrical Insulation (SCI), vol. 30, no. 3, June 2023, pp. 1231-1239. doi: 10.1109/TDEI.2023.3237795 (SCI).

• Chilaka Ranga, Ashwani Kumar and Rajeevan Chandel, “Condition assessment of power transformers based on multi-attributes using fuzzy logic,” IET Science Measurements and Technology, IET, vol. 11, no.4, pp. pp. 983-990, July 2017. (SCI)

• Chilaka Ranga and Manoj Teruvai, “Multi-criterion fuzzy model for power transformer insulation monitoring,” Electrical Engineering, Taylor and Francis, vol. 104, pp. 3535–3546, 2022.(SCI)

• Chilaka Ranga, Ashwani Kumar and Rajeevan Chandel, “Performance analysis of alternative solid dielectrics of transformers with a blend of mineral and silicon oils,” IETE Technical Review, vol. 35, issue 4, pp. 331-341, Taylor & Francis,Mar 2017. (SCI)

• Chilaka Ranga, Gopi Mulpuru, “Multi-Criterion Analysis based Artificial Intelligence System for Condition Monitoring of Electrical Transformers,” Insight - Non-Destructive Testing and Condition Monitoring, accepted for publication, March 2024. (SCI)

• T. Manoj, C. Ranga, "An intelligence expert system for quality health monitoring of power transformers using testing attributes," in Engineering Research Express, vol. 5, 2023 (SCI), doi: 10.1088/2631-8695/acd2a8.

• Chilaka Ranga, Nasir Wani, “A Review of Health Index Based Condition Assessment Techniques for Power and Distribution Transformers,” Insight - Non-Destructive Testing and Condition Monitoring (The Journal of The British Institute of Non-Destructive Testing), accepted for publication, Sep. 2023. (SCI)

• Chilaka Ranga and Manoj Teruvai, “Oil health index calculation and incipient fault diagnosis in power transformers using fuzzy logic,” Insight - Non-Destructive Testing and Condition Monitoring, vol. 64, no. 1, pp 28-37, Jan. 2022. (SCI)

• Chilaka Ranga, Ashwani Kumar and Rajeevan Chandel, “Influence of Electrical and Thermal Ageing on the Mineral Insulating Oil Performance for Power Transformer Applications,” Insight - Non-Destructive Testing and Condition Monitoring (The Journal of The British Institute of Non-Destructive Testing), vol. 62, no. 4, pp 1-8, April 2020. (SCI)

• Chilaka Rangaand Ashwani Kumar, “Influence of Accelerated Thermal Aging on Performance of Alternative Solid Dielectrics for Power Transformers,”  Insight - Non-Destructive Testing and Condition Monitoring (The Journal of The British Institute of Non-Destructive Testing), Accepted for publication, 2019. (SCI)

• Chilaka Ranga, Ashwani Kumar and R. Chandel, “Expert system for condition monitoring of power transformers using fuzzy logic,” Journal of Renewable and Sustainable Energy, AIP Publishing, vol. 9, no. 4, pp. 1-16, July 2017. (SCI)

• Chilaka Ranga, Ashwani Kumar and R. Chandel, “Performance analysis of cellulose and Nomex impreganted oil filled power transformers," International Journal of Electrical Engineering and Informatics, IJEEI, vol. 9, no. 2, pp. 394-406, July 2017. (SCOPUS) 

• Chilaka Ranga, Ashwani Kumar and R. Chandel, “Fuzzy logic expert system for optimum maintenance of power transformers,” International Journal of Electrical Engineering and Informatics, IJEEI, vol. 8, no. 4, pp. 836-850, September 2016 (SCOPUS)

• Chilaka Ranga, Ashwani Kumar and N. Sudheer Reddy, “Life estimation of thermally insulating papers of rotating machines by Arrhenius Model,” Materials Toady Proceedings, vol. 9, no. 4, pp. 10643-10647, 2017. (SCOPUS)

• Chilaka Ranga and Ashwani Kumar, “Expert system for health index assessment of power transformers,” International Journal of Electrical Engineering and Informatics, IJEEI, vol. 9, no. 4, pp. 836-850, December  2017. (SCOPUS)

• Chilaka Ranga, Ashwani Kumar and R. Chandel, “Experimental effectiveness estimation of inhibitors on oxidation degradation of oil impregnated paper insulation in power transformers,” i-Managers Journal of Power System, vol. 4, no. 1, pp. 1-8, January 2017. (UGC listed)

• Chilaka Ranga, Ashwani Kumar and R. Chandel, “Effect of ambient conditions on performance of  power transformers,” i-Managers Journal of Electrical Engineering, vol. 10, no. 2, pp. 1-8, December 2016. (UGC listed)

• Chilaka Ranga, Ashwani Kumar and R. Chandel, “Multi-Attributes based health assessment of power transformers,” i-Managers Journal of Power System, vol. 4, no. 3, pp. 28-38, October 2016. (UGC listed)

International Conferences

• Chilaka Ranga, Manu Kumari and Ashwani Kumar, “Validating Health Status of transformer: Grey Relational Analysis and Fuzzy Logic”, ICECCT- 2023.

• Chilaka Ranga, “Thermal performance evaluation of power transformer insulation using UV-visible spectroscopy”, 1^stInternational Conference on Emerging Technologies in Engineering and Science (ICETES), DVR & Dr. Hs MIC CT, Kanchikacherla, July 2023.

• Nasir Wani, Chilaka Ranga, Manoj Teruvai, Gopi Mulpuru, “Effects of cold climates on dielectric behavior of oil immersed power transformers: Challenges and Remedies”, International Conference on Emerging Trends in Engineering and Technology (ICETET), NREC, Hyderabad, 9-10 June, 2023.

• Chilaka Ranga and Manoj Teruvai, “Performance Evaluation of Thermally Stressed Solid Dielectrics for Transformers,” IEEE Power India International Conference (PIICON-2020), IEEE, Haryana, India, Dec. 2020.

• Chilaka Ranga and Ashwani Kumar, “Remnant life assessment of TUK and nomex-910 impregnated transformers using Raman spectroscopy,” 3rd International IEEE Conference on Condition Assessment Techniques in Electrical Systems (CATCON-17), IEEE, IIT Ropar, July, 2017.

• Chilaka Ranga, Anjali Kumari and Ashwani Kumar, “A novel fuzzy logic model for accurate health assessment of power transformers,” IEEE International Conference on Computing and sustainable Global Development (INDIACom-17), IEEE, Bharthi Vidhyapeet, Delhi, India, pp. 1-5, 01-03 March 2017.

• Manoj Kumar, Chilaka Ranga and Ashwani Kumar, “Thermal evaluation and oxidation stability of high temperature alternative solid dielectrics of power transformers in mixed oil,” International Conference on Advancements in Energy, Drive and Control (ICAEDC-17), Springer, Delhi-India, pp. 1-5, 7-8 March 2017.

• Ashish Mishra, Chilaka Ranga and Ashwani Kumar, “Furfural analysis of TUK and nomex-910 insulated power transformers using Raman spectroscopy,” International Conference on Advancements in Energy, Drive and Control (ICAEDC-17), Springer, Delhi-India, pp. 1-6, 7-8 March 2017.

• Chilaka Ranga and Ashwani Kumar, “A multi-regression analysis for health assessment of power transformers in consideration of ambient conditions,” 14th DobleIndia Power Forum, Doble Engineering, Vadodara, India, pp. 1-7, November 29 – December 2, 2016.

• Chilaka Ranga and Ashwani Kumar, “Effect of accelerated thermal aging on dielectric strength of electrical insulating papers,” 14^th DobleIndia Power Forum, Doble Engineering, Vadodara, India, pp. 1-5, November 29 – December 2, 2016.

• Chilaka Ranga and Ashwani Kumar, “Oxidation stability of TUK and Nomex insulated power transformers,” International IEEE India Conference (INDICON-16), IEEE, IISC Bangalore, India, pp. 1-5, 16-18 December, 2016.       

• Chilaka Ranga and Ashwani Kumar, “Multi-criterion approach for dissolved gas analysis of transformer oil,” IEEE Uttar Pradesh Section Conference on Electrical and Electronics Engineering, IEEE, IIIT Allahabad, India, pp. 1-6, 4-6 December 2015. 

• Chilaka Ranga and Ashwani Kumar, “Advanced tool based condition monitoring of induction machines by using LabVIEW–A Review,” IEEE Uttar Pradesh Section Conference on Electrical and Electronics Engineering (UPCON-2016), IEEE, IIIT Allahabad, India, pp. 1-5, 4-6 December 2015.

Books/Chapters

• Manoj Teruvai and Chilaka Ranga, ‘Fuzzy Logic Expert System for Diagnosis of Power Transformer’, Fuzzy Systems - Theory and Applications, Wiley, Scrivener Publishing, June, 2021, DOI: 10.5772/intechopen.98663, ISBN: 978-1-83962-292-2.

• Manoj Teruvai and Chilaka Ranga, ‘Calculation of Health Index for Power Transformer Solid Insulation using Fuzzy Logic’, Lecture Notes in Electrical Engineering, vol. 768, Springer, 2020, 10.1007/978-981-16-2354-7_52, ISBN978-981-16-2354-7.

• Chilaka Ranga, Manoj Kumar, Ashwani Kumar and Ashish Mishra, Thermal evaluation and oxidation stability of high temperature alternative solid dielectrics of power transformers in mixed oil, Chapter in Advances in Energy and Power Systems, Springer, 2018, ISBN: 9789811306617

• Teruvai Manoj, Chilaka Ranga, Mulpuru Gopi and Nasir Ul Islam Wani, “A Fuzzy Based Fault Diagnostic Model for Oil-Immersed Load Tap Changers” In: Machine Learning, Advances in Computing, Renewable Energy and Communication. Lecture Notes in Electrical Engineering- Accepted for presentation at MARC-2023.

• Nasir Ul Islam Wani, Chilaka Ranga, Teruvai Manoj and Mulpuru Gopi, “Dielectric Behaviour Power Transformers Installed in Extreme Cold Climates: Case Studies and Challenges” In: Machine Learning, Advances in Computing, Renewable Energy and Communication. Lecture Notes in Electrical Engineering Accepted for presentation at MARC-2023.

• Mulpuru Gopi, Chilaka Ranga, Teruvai Manoj and Nasir Ul Islam Wani, “An Effective Health Assessment of Transformers using Multi-criterion based Triangular Fuzzy Logic” In: Machine Learning, Advances in Computing, Renewable Energy and Communication. Lecture Notes in Electrical Engineering Accepted for presentation at MARC-2023.

 Research Projects

• ‘Performance Evaluation of Advanced Dielectric Materials in Transformers’, Department of Scientific and Industrial Research (DSIR) sponsored, Rs. 9.964 lakh (Feb. 2022 – Jan. 2024).

•  ‘Performance Evaluation and Health Assessment of Transformers’ funded by TEQIP-II, NIT Hamirpur, Rs. 152000/- (March 2015 to April 2016).

Patents:

• An Electro-thermal Combined Stress Aging Test Cell and its Application Therof, Granted in April 2024, Indian Patent Office.

• A Recommendation System and Method for E-Commerce using Machine Learning, Granted in Oct. 2021, Australian Patent Office.

• An Ecofriendly method to improve the life cycle of a transformer by using an inhibitor composition, published in July2023, Indian Patent Office.

• An AI based Duval  triangle fault diagnostic method for oil-immersed power transformers and its application thereof, published in Feb. 2024, Indian Patent Office.

Ph.D. Guided

• Manoj Teruvai, ‘Health Assessment and Fault Diagnosis of Power Transformer’ Thesis submitted in Feb. 2024.

• Nasir Ul Wani, 'Impact of extreme cold weather on performance of power transformers in Kashmir valley,' on-going. 

• M. Gopi, 'Application of artificial neural neworks in condition monitoing of power transformers,' on-going.